From perldoc -f keys section of the perlfunc manpage:
The actual random order is subject to change in future versions of perl, but it is guaranteed to be the same order as either the "values" or "each" function produces (given that the hash has not been modified).
So in short you cannot depend on the keys, values, or each functions to provide results in a pre-determined order. There are ways around this .. I believe (haven't actually used it personally) that Tie::Hash Tie::IxHash can (will?) preserve hash order for you. Also, you can always sort the results of keys/values calls. For example: 
my %h = ( ... );
foreach my $k ( sort { lc $a cmp lc $b } keys %h ){   # get keys sorte
+d by lowercase of key
  ...
}
foreach my $k ( sort { lc $h{$a} cmp lc $h{$b} } keys %h ){  $ get key
+s sorted by lowercase of value
  ...
}

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In reply to Re: Determining hash order for sorting array by davidrw
in thread Determining hash order for sorting array by PenguinPwrdBox

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